Trying to get 3 Wither Skulls

Part 18 in my 'first time playing minecraft in 6 years' series. In the last part I had to mine for iron, coal etc because I lost it all in a previous episode, now that I have all that I moved on to the more more fun stuff, so I tried to summon the wither, it's a lot harder than I thought it would be, and I didn't expect the wither skull to be so rare to drop

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Watch more if you want to:

Iron Golem Turns on me
   • Iron Golem Turns on me  

Why you shouldn't dig straight down
   • Why you shouldn't dig straight down  

Finding an Ocean Monument
   • Finding an Ocean Monument